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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K Annual Report Pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 For the fiscal year ended September 30 , 2021 . Transition Report Pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 For the transition period from to Minnesota ( State of incorporation ) Title of each class Commission File Number 0-16106 CLEARFIELD , INC . ( Exact Name of Registrant as Specified in its Charter ) 7050 Winnetka Avenue North Suite 100 Brooklyn Park , Minnesota 55428 ( Address of principal executive office ) Securities registered pursuant to Section 12 ( b ) of the Act : Common Stock , $ 0.01 par value Trading Symbol CLFD NONE ( 763 ) 476-6866 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( g ) of the Act : 41-1347235 ( I.R.S. Employer Identification No. ) Yes > No Name of each exchange on which registered The NASDAQ Stock Market LLC Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes > No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Exchange Act . Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . X Yes - No